I've had a pretty good run of calling the MS support line and getting them to reactivate if Win10 deactivates due to a hardware change. Takes 5 minutes, maybe.

I've had a pretty good run of calling the MS support line and getting them to reactivate if Win10 deactivates due to a hardware change. Takes 5 minutes, maybe. Occasionally if you're on an upgraded-from-win7 or 8.1 OEM license the service agent will tell you that it can't be done for OEMs but hanging up, calling back and getting a less fastidious agent on the line is easily done. Agreed, though - paying 3 times for the same software would be insane, especially at MS prices